theres just one cat... its "high flowing" I would think my stock midpipe is killing me the most. I bought a piece off somebody here but its too long (so if anyone cuts and welds cheap lmk..) I was going to buy Chucks VF-39 but i think he traded it in with his car... so I dunno, the mod bug has been biting lately and grimmspeed pnp stuff seems cheap, faster, reliable, etc.